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<?php $str = "=~*_Размер 3 * 2"; echo preg_replace('/^[^\p{L}\d]+/u', '', $str);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/sQ10O
function name:  (null)
number of ops:  5
compiled vars:  !0 = $str
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%3D%7E%2A_%D0%A0%D0%B0%D0%B7%D0%BC%D0%B5%D1%80+3+%2A+2'
    4     1        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F%5E%5B%5E%5Cp%7BL%7D%5Cd%5D%2B%2Fu', ''
          2        OP_DATA                                                      !0
          3        ECHO                                                         ~2
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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